Exhaust Or Top Gas Reused Or Treated Patents (Class 75/10.36)
  • Patent number: 8425650
    Abstract: A method for manufacturing molten metal by using a stationary non-tilting electric furnace comprising: forming a raw material layer by charging a particular amount of a carbonaceous material and/or metal oxide agglomerates with carbonaceous material containing a nonvolatile metal element that forms molten metal into the furnace from the raw material charging chute, and having a sloping surface extending downward from the one end of the furnace toward the other end of the; subsequently forming an agglomerate layer on the sloping surface of the raw material layer by charging a particular amount of the metal oxide agglomerates with carbonaceous material into the furnace from the raw material charging chute; and subsequently forming a molten metal layer and a molten slag layer in the furnace by heating the lower end of the agglomerate layer with the heater.
    Type: Grant
    Filed: April 22, 2009
    Date of Patent: April 23, 2013
    Assignee: Kobe Steel, Ltd.
    Inventor: Masahiko Tetsumoto
  • Patent number: 7993130
    Abstract: Method of combustion with a gas burner having a burner head at one end of an inner gas pipe surrounded by an outer protective pipe, wherein gases from the burner head flow inside the inner pipe and inside the outer pipe and thereafter flow into an exhaust channel. The inner pipe terminates short of the burner head; a sleeve downstream of the burner head, is inserted into and/or placed concentrically with the inner pipe so that the sleeve orifice is located within the inner pipe; a gap is provided between the opening of the inner pipe and the sleeve. The gap is sized such that the mixture of fuel and combustion air from the burner head and recycled exhaust gases passing through the gap will be mixed in quantities at which the temperature of combustion will be lower than the temperature in which NOx is formed.
    Type: Grant
    Filed: October 10, 2005
    Date of Patent: August 9, 2011
    Assignee: Sandvik Intellectual Property AB
    Inventors: Thomas Lewin, Pauli Mäenpää, Jörgen Sjöberg, Ole Stadum
  • Publication number: 20110011211
    Abstract: A process for the production and/or treatment of at least one metal in a reactor includes discharging a waste gas stream via a waste gas conduit and after-treating the waste gas stream by supplying a cooling gas and/or a cooling gas mixture. The after-treating includes injecting the cooling gas and/or cooling gas mixture into the waste gas conduit on a side of the waste gas conduit facing the reactor, at a high velocity and substantially tangentially with respect to a main flow direction of the waste gas. A volume of the cooling gas and/or the cooling gas mixture injected into the waste gas conduit is adjusted so as to reduce a mixing temperature below a melting temperature of the molten particles and/or a condensation temperature of the vaporous constituents of the waste gas stream.
    Type: Application
    Filed: February 12, 2009
    Publication date: January 20, 2011
    Applicant: OUTOTEC OYJ
    Inventors: Andreas Orth, Michael Stroeder, Jean-Paul Nepper
  • Publication number: 20100263484
    Abstract: A smelting furnace having a vessel (102) for receiving material to be smelted. An inner surface (109) of the furnace is concave and reflective, at least an upper part thereof. A conductive electrode (120) of the furnace is continuously formed in the furnace by casting.
    Type: Application
    Filed: August 11, 2006
    Publication date: October 21, 2010
    Applicant: ADVANCED INTELLECTUAL HOLDINGS PTY LTD
    Inventor: Leslie Philip Moore
  • Patent number: 7785389
    Abstract: A method of operating a channel induction furnace to process a feed material and obtain therefrom at least one of a molten metal product, a vapor phase metal product and a slag product. The method includes avoiding the formation of islands of materials that are fed into the channel induction furnace. The method also involves breaking up islands of materials that are formed within the channel induction furnace. The method further involves adding a heat-conducting metal material into the channel induction furnace together with the feed material.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: August 31, 2010
    Assignee: Heritage Environmental Services, LLC
    Inventors: James E. Bratina, Thomas Edward Roberts
  • Patent number: 7776126
    Abstract: A method of operating a channel induction furnace to process a feed material and obtain therefrom at least one of a molten metal product, a vapor phase metal product and a slag product. The method includes applying a controlled vacuum on the headspace of the channel induction furnace to controlling the amount of ambient air that enters the furnace or adding oxygen into the channel induction furnace. The method also includes controlling the carbon concentration in the molten bath in the channel induction furnace to control the fluidity of the bath.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: August 17, 2010
    Assignee: Heritage Environmental Services, LLC
    Inventors: James E. Bratina, Thomas Edward Roberts
  • Patent number: 7727302
    Abstract: A method of operating a channel induction furnace to process a feed material and obtain therefrom at least one of a molten metal product, a vapor phase metal product and a slag product. The method involves maintaining a slag layer on the molten bath that has a thickness that is sufficient to support the feed material while minimizing heat transfer through the slag layer and minimizing the resistance of vapor phase components from transferring through the slag layer. The fluidity of the slag layer is controlled by heating the slag layer and adjusting the chemistry of the slag layer.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: June 1, 2010
    Assignee: Heritage Environmental Services, LLC
    Inventors: James E. Bratina, Thomas Edward Roberts
  • Patent number: 6849101
    Abstract: In a method for recovering Al from an off-gas (3,4) produced during carbothermic reduction of aluminum utilizing at least one smelter (1,2), the off-gas (3,4) is directed to an enclosed reactor (5) which is fed a supply of wood charcoal (7) having a porosity of from about 50 vol. % to 85 vol. % and an average pore diameter of from about 0.05 ?m to about 2.00 ?m, where the wood charcoal (7) contacts the off-gas (3,4) to produce at least Al4C3 (6), which is passed back to the smelter (1,2).
    Type: Grant
    Filed: December 4, 2003
    Date of Patent: February 1, 2005
    Assignees: Alcoa Inc., Elkem ASA, Carnegie Mellon University
    Inventors: Richard J. Fruehan, Yun Li, Gerald Carkin
  • Patent number: 6562101
    Abstract: Methods and apparatus for processing electric arc furnace (“EAF”) dust through a basic oxygen furnace (BOF) to recover iron value from the EAF dust and concentrate zinc from the EAF dust into a material useful as a feed in zinc manufacturing processes. The method results in the reduction of the burden for the regulatory tracking of EAF dust. In addition, the method provides economic savings which result from the reduction of processing fees and the recovery of the value of iron and zinc materials. The apparatus involves the use of existing equipment that is used to recover iron value from other materials generated at steel making facilities, or the installation of new equipment for the purpose of iron reuse.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: May 13, 2003
    Assignee: Heritage Environmental Services, LLC
    Inventors: Kenneth S. Price, Kim Lenti
  • Patent number: 6530970
    Abstract: A method for aluminum recovery during the carbothermic production of aluminum in a smelting furnace (1,2) is disclosed, where during carbothermic reduction of alumina, aluminum and aluminum suboxide vapors are produced (3, 4), which are reacting with carbon. Reactive carbon is generated in situ by the cracking of hydrocarbon compounds (6) in a separate closed reactor vessel (5) at a temperature greater than about 1955° C. Solid aluminum carbide that formed during the reaction can then be recycled by a conduit (8) to the primary reactor for reduction to aluminum, and reactor gas (10) can be fed to a cooler (9).
    Type: Grant
    Filed: May 21, 2001
    Date of Patent: March 11, 2003
    Assignees: Alcoa Inc., Elkem ASA
    Inventor: Tor Lindstad
  • Patent number: 6372009
    Abstract: A process and apparatus for continuously reducing carbon monoxide (CO), uncombined free hydrogen (H2) and volatile hydrocarbons (VOC's) in molten metal refining vessel off-gases without forming undesirable oxides of nitrogen. Off-gases are directed to a reaction chamber wherein CO, H2 and VOC's are oxidized at a controlled temperature and with a controlled quantity of O2 So as to realize substantially total oxidation of gases present with minimized formation of oxides of nitrogen. Volume and energy of treated gases directed for baghouse treatment are reduced in comparison with prior practice.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: April 16, 2002
    Assignee: Kvaerner Metals
    Inventors: Ronald L. W. Holmes, Frank A. Hultgren
  • Patent number: 6206948
    Abstract: A metal reduction and melting process which involves the heating of a burden comprising a metal containing component and a carbon containing component in a channel type induction furnace in order to reduce such metal containing component, in which at least part of the gaseous products of the process is utilized for preheating the burden; and apparatus for carrying out such preheating.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: March 27, 2001
    Assignee: Ipcor NV
    Inventor: Louis J. Fourie